Dentist&#39;s tool for crimping edges of metal crowns.



No. 738,152. PATBNTBD SEPT. s, 1903.

E. Emits. DENTISTS. mm mm GRIMPIRG BDGES 0F METAL cnowws.

AYP'P'I'JOATION FILED APR. 23, 1903 NO MODEL.

INVENTOR:

WITNESSES:

Patented September 8, 1903.

PATENT OFFICE.

EDWIN BETTS, OF NEWARK, NEW JERSEY.

DENTISTS TOOL FOR CRIMPIN G EDGES OF METAL CROWNS.

SPECIFICATION forming part of Letters Patent No. 738,152, datedSeptember 8, 1903.

Application filed April 23,1903- f'o all whom it 722mg concern.-

Be it known that I, EDWIN BETTs, a citizen of the United States,residing at Newark, in the county of Essex and State of New Jersey, haveinvented certain new and useful Improvements in Dentists Tools forCrimping Edges of Metal Crowns; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and tonumerals of reference marked thereon, which form a part of thisspecification.

This invention has reference to improvements in tools for dentists use;and the invention has for its principal objects to provide a novelconstruction of tool, made in the manner of forceps, which is to be usedwith a dental crown or cap, such as is applied upon the upper portion orcrown of a tooth, for the purpose of readily crimping or closing againstthe neck of the tooth the open marginal edge portions of the metal crownor cap, and thereby producing a perfect and tight joint, as will behereinafter more particularlyset forth.

In practice the metal crowns or caps are placed over the tooth which isto be capped and secured on such tooth with a cement, the lower marginaledge portions of the crown or cap then being crimped about the smallerneck portion of the tooth. These crowns or caps are approximately of thegeneral shape and contour of that part of the tooth above its neck; butsince the extreme upper portion of the tooth generally is of less widththan that part of the tooth directly above the neck and the latterusually being much smaller in width than the other upper portions of thetooth the metal cap or crown is made tapering toward its lower marginaledge portion and when arranged upon the tooth, as herein shown, leavesan open space between the lower inner part of the cap or crown and theneck of the tooth, as will be clearly evident. So far as known no toolwas heretofore made for readily grasping this marginal edge portion ofthe metal cap or crown and by means of which this edge portion could becrimped in one or two operations directly about the neck of the toothand beneath the larger shoulder of the body of the tooth 10- Serial No.153,927, (No model.)

cated directly above the said neck, and for that reason I haveendeavored to provide a tool in the shape of forceps having clamping orcrimping members which can easily be placed about any part of the toothand the metal cap or crown thereon and can readily be manipulated in themouth of the patient and without any discomfort to the patient.

With the various objects of my invention in view the same consists inthe novel construction of dentists tool, to be hereinafter more fullyset forth, for quickly securing and crimping a metal crown or cap upon atooth.

My invention consists, furthermore, in such novel arrangements andcombinations of the parts of the tool, all of which will be hereinaftermore fully described and then finally embodied in the claim.

The invention is clearly illustrated in the accompanying drawings, inwhich Figure 1 is a side view of the tool embodying the principles ofthis invention; and Fig. 2 is a plan view of the tool, the jaws ofthetool in both the said views being represented in their crimpingpositions when in the act of clamping or crimping the marginal edge of acrown or cap about the neck of a tooth. Fig. 3 is a face view of atooth, illustrating the general shape and contour of the same and intransverse vertical section a metal crown or cap in position upon thetooth and before its open marginal edge is crimped or clamped fast aboutthe tooth.

Similar characters of reference are employed in all of the saidhereinabovedescribed views to indicate corresponding parts.

In the said above-described drawings the reference character 1 indicatesthe complete tool, which consists, essentially, of a pair of handleportions 2 and 3, pivotally connected at 4 by means of a pin or rivet,substantially as illustrated. Each handle portion 2 and is provided witha forwardly and preferably downwardly extending member 5 and 6,respectively, the same being of any desired and suitable configuration.The said member, 5 is provided at its free end with a jaw orcrimping-section 7, having a concaved surface or portion 8 ofapproximately a part of the curved surface of a tooth. In like mannerthe said member 6 is provided at its free end with a jaw or crimpingmember 9, having a concaved surface or portion 10 of approximately apart of the curved surface of a tooth. The curved surfaces or portions 8and 10 of the jaws or crimping members 7 and 9 are located opposite eachother, so that they can be placed on opposite surfaces of the tooth, asillustrated in Fig. 2 of the drawings, and'caused to exert pressure onthe 0pposite sides of the tooth when the handle portions 2 and 3 aregrasped in the hand and when pressure is applied by the operator uponsaid handle portions, as will be clearly understood.

The manner of using the tool for attaching the metal crown or cap to atooth is as follows: In Fig. 3 I have represented a tooth 11, the upperpart of which is indicated by the reference-numeral 12, the tooth, as isrepresented in said Fig. 3, having the downwardly and outwardly taperingsurface 13, forming just above the reduced part 14, commonly termed theneck of the tooth, an annular enlargement or shoulder 15. The metalcrown or cap 16 is made, as will be seen from an inspection of said Fig.3, of the general contour of the upper portion 12 of the tooth 11 andhas its surrounding portion 17 made to taper outwardly, as shown. Thisis for the purpose of readily fitting the cap or crown 16 with the usualretaining-cement easily upon the tooth. When arranged in this mannerover the body portion 12 of the tooth, the lower marginal edge 18projects below the surrounding shoulder or enlargement 15 of the tooth,and thereby leaves an unsightly and objectionable edge surrounding andprojecting away from the neck 14 of the tooth, as illustrated. Byplacing the oppositely-located and concaved surfaces or portions 8 and10 ofthe jaws or crimping members 7 and 0 of the tool 1 against theopposite surfaces of the outwardly-projecting edge 18 of the metal crownor cap 16 the said edge can easily and quickly be fitted and crimpedabout the neck 14 of the tooth and directly beneath the annularprojection or shoulder 15 of the tooth, the tool being easilymanipulated without discomfort to both the patient and operator, and aneat and perfectly-tight fit is made without detriment to the tooth.

From the above description it willbe clearly evident that I haveprovided a simple and inexpensive tool which can easily be manipulatedand which can be worked in the mouth of the patient on all sides of thetooth to secure the results desired.

I am aware that some changes may be made in the details of theconstruction of the tool without departing from the scope of myinvention. Hence I do not limit my invention to the exact arrangementsof the various parts and the details of the construction of the tool asdescribed in the foregoing specification and as illustrated in theaccompanying drawings.

Having thus described my invention, what I claim is A dentists tool forcrimping the marginal edges of metal caps or crowns about the necks ofteeth, comprising, a pair of pivoted handle portions, aforwardly-extending member connected with each handle portion, acrimping-section at the free end of each forwardlyextending member, anda concaved surface in each crimping-section, said concaved surfacesbeing located opposite each other, substantially as and for the purposesset forth.

In testimony that I claim the invention set forth above I have hereuntoset my hand this 21st day of April, 1903.

EDWIN BETTS.

Witnesses:

FREDK. C. FRAENTZEL, W. B. FRAENTZEL.

